Hello,
in my current LCA study, I am modelling wastewater treatment technologies. thus, the model has its characteristics more like a MFA-model than a typical LCA-model considering the distinct life cycle stages such as production-phase / use-phase etc.
in the attachment I put one example.
now the problem:
by dividing the impact result from the excel-file (export LCIA raw data) by the specific material flow, there are different results coming up.
as an example, I put here the electricity:
dividing the GWP-impact from electricity used [kg CO2-eq] by the amount of electricity used [kWh] there are some deviations, which should not be the case...
in following processes electricity has an impact of
643,6 g CO2-eq/kWh:
- T10 (electricity used in T02: Vermischung Volumenströme)
- T11 (electricity used in T05: P-Entfernung)
- T90 (electricity produced in T90)
in the next processes, there are others quotients calculated from the results of the excel-file:
- T12 (electricity used for Subnet: Schlammbehandlung): 530,2 g CO2/kWh
- T13 (electricity used for Ozonation): 504,0 g CO2/kWh
First, there were different quotients for all processes. So, I thought by setting the allocation manually in each single process, I could fix the problem. But still, the specific impact-factor of electricity (probably 643,6 gCO2-eq/kWh) is not unique in all processes.
in the other attachments, there is an example how a process and the allocation is done (here: ozonation).
Can anyone help?